As Palle and Erik say, we don’t have enought info to help you. It seems like a customized report. The shared folder has to have permissions for both, you and user used to run Dynamics NAV server, and the recommended path will be \server_name\publicfolder_name\path_to_file, because if you use letters, they can be different in diferent computers, or the same letter in different computers point to diffent servers and/or public folders.